The HDFC bank's reference request numbers are very cryptic. I did KYC on Saturday. Then Monday evening got some reference number. I did not thought its related to KYC as I already got Service request ID on Saturday when completed online KYC. Also, I don't know how to track any service request number sent to me via SMS on HDFC bank website.
Today just now I received sms that said same reference number given to me on Monday has been processed successfully. I then opened HDFC mobile app and found my KYC status changed to "Y".
So it took like 3-4 days for them to process my KYC. Thank you
@PRITAM_CARD for your continued help here.